// SPDX-License-Identifier: GPL-2.0-or-later /* * kernel/configs.c * Echo the kernel .config file used to build the kernel * * Copyright (C) 2002 Khalid Aziz <khalid_aziz@hp.com> * Copyright (C) 2002 Randy Dunlap <rdunlap@xenotime.net> * Copyright (C) 2002 Al Stone <ahs3@fc.hp.com> * Copyright (C) 2002 Hewlett-Packard Company */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/proc_fs.h> #include <linux/seq_file.h> #include <linux/init.h> #include <linux/uaccess.h> /* * "IKCFG_ST" and "IKCFG_ED" are used to extract the config data from * a binary kernel image or a module. See scripts/extract-ikconfig. */ asm ( " .pushsection .rodata, \"a\" \n" " .ascii \"IKCFG_ST\" \n" " .global kernel_config_data \n" "kernel_config_data: \n" " .incbin \"kernel/config_data.gz\" \n" " .global kernel_config_data_end \n" "kernel_config_data_end: \n" " .ascii \"IKCFG_ED\" \n" " .popsection \n" ); #ifdef CONFIG_IKCONFIG_PROC extern char kernel_config_data; extern char kernel_config_data_end; static ssize_t ikconfig_read_current(struct file *file, char __user *buf, size_t len, loff_t * offset) { return simple_read_from_buffer(buf, len, offset, &kernel_config_data, &kernel_config_data_end - &kernel_config_data); } static const struct proc_ops config_gz_proc_ops = { .proc_read = ikconfig_read_current, .proc_lseek = default_llseek, }; static int __init ikconfig_init(void) { struct proc_dir_entry *entry; /* create the current config file */ entry = proc_create("config.gz", S_IFREG | S_IRUGO, NULL, &config_gz_proc_ops); if (!entry) return -ENOMEM; proc_set_size(entry, &kernel_config_data_end - &kernel_config_data); return 0; } static void __exit ikconfig_cleanup(void) { remove_proc_entry("config.gz", NULL); } module_init(ikconfig_init); module_exit(ikconfig_cleanup); #endif /* CONFIG_IKCONFIG_PROC */ MODULE_LICENSE("GPL"); MODULE_AUTHOR("Randy Dunlap"); MODULE_DESCRIPTION("Echo the kernel .config file used to build the kernel");